CN204517815U - A kind of luminous power overload protecting circuit - Google Patents
A kind of luminous power overload protecting circuit Download PDFInfo
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- CN204517815U CN204517815U CN201520217522.7U CN201520217522U CN204517815U CN 204517815 U CN204517815 U CN 204517815U CN 201520217522 U CN201520217522 U CN 201520217522U CN 204517815 U CN204517815 U CN 204517815U
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Abstract
The utility model relates to optical communication field; disclose a kind of luminous power overload protecting circuit; when solving by the mode of series resistor between APD and relevant work voltage the problem that luminous power transships to solve in prior art; due to the accurate and complexity that resistance is selected; and be difficult to obtain optimum reception sensitivity, the even APD technical problem that cannot normally work.This circuit comprises: photocurrent detection device, for detecting the size of received optical power and being converted to current signal; Luminous power stage circuit, for the first pad value of the first current value determination light signal based on current signal, and produces the control signal controlled the power of light signal based on the first pad value; Optical signal input, for receiving optical signals; Optical power attenuation device, is less than predetermined power value for the power controlling light signal based on control signal; Light signal output end, the light signal inputted for received optical power attenuator also exports.Reach the technique effect of the sensitivity ensureing Signal reception.
Description
Technical field
The utility model relates to optical communication field, particularly relates to a kind of luminous power overload protecting circuit.
Background technology
In prior art, optical receiving device frequently occurs that received optical power overload affects the technical problem in photodetector useful life, causes its sensitivity decrease, the reception error rate increases, affect proper communication, even cause permanent damage, cause significant impact to user.
Current industry eliminates the solution of luminous power overload; mainly through at APD (Avalanche PhotoDiode; avalanche photodide) and relevant work voltage between series resistor; the big current that overload luminous power produces produces pressure drop by this resistance, thus reduces APD voltage with protective circuit.
At least there is following technical problem in the scheme of prior art:
1. the program is while reducing APD voltage, because APD cannot be operated in best reception state, thus introduces larger noise, also by the sensitivity that impact receives, may cause error code;
2. choosing of this resistance needs through experiment repeatedly and debugging, and due to resistance selection complexity, and be difficult to obtain optimum reception sensitivity, even APD cannot normally work;
3. the program also can only be used in and need enough reverse bias voltages just can be operated in the photodetector of best reception state containing APD is this, the main mode adopting reduction reverse bias voltage, and APD equipment is not contained for EPON (Ethernet Passive Optical Network: Ethernet passive optical network) unit etc., the problem of received optical power overload cannot be solved;
4. this resistance also will produce extra power loss.
Utility model content
The utility model provides a kind of luminous power overload protecting circuit, when solving the problem of luminous power overload by the mode of resistance reducing APD to solve in prior art, cause the technical problem of receiving sensitivity step-down.
The utility model embodiment provides a kind of luminous power overload protecting circuit, comprising:
Photocurrent detection device, is converted to current signal for receiving optical signals by the size of the luminous power of described light signal;
Luminous power stage circuit, is connected to described photocurrent detection device, for determining the first pad value of described light signal based on the first current value of described current signal, and produces based on described first pad value the control signal controlled described luminous power;
Optical signal input, for receiving described light signal;
Optical power attenuation device, is connected to described luminous power stage circuit and described optical signal input, and for after the light signal receiving the input of described optical signal input, the power controlling described light signal based on described control signal is less than predetermined power value;
Light signal output end, is connected to described optical power attenuation device, for receiving the light signal of described optical power attenuation device input and exporting.
Optionally, also comprise:
Pad value arranges pin, is connected to described luminous power stage circuit, for arranging the minimal attenuation value of described light signal.
Optionally, described luminous power stage circuit, specifically for:
Based on the corresponding relation between current value and pad value, determine and described first pad value corresponding to described first current value.
Optionally, described luminous power stage circuit, specifically for:
Determine the first current range corresponding to described first current value;
Be determined at described first pad value corresponding to described first current range.
Optionally, described luminous power stage circuit, specifically for:
Determine the first performance number corresponding to described first current value;
Determine described first pad value corresponding to described first performance number.
Optionally, described luminous power stage circuit, specifically for: produce based on described first pad value the current controling signal that described optical power attenuation device is controlled; Or produce based on described first pad value the voltage control signal that described optical power attenuation device is controlled.
The utility model beneficial effect is as follows:
Due in the utility model embodiment, provide a kind of luminous power overload protecting circuit, comprising: photocurrent detection device, for detecting receiving optical signals and the size of the luminous power of light signal being converted to current signal; Luminous power stage circuit, is connected to described photocurrent detection device, for determining the first pad value of described light signal based on the first current value of described current signal, and produces based on described first pad value the control signal controlled described luminous power; Optical signal input, for receiving described light signal; Optical power attenuation device, is connected to described luminous power stage circuit and described optical signal input, and for after the light signal receiving the input of described optical signal input, the power controlling described light signal based on described control signal is less than predetermined power value; Light signal output end, is connected to described optical power attenuation device, for receiving the light signal of described optical power attenuation device input and exporting.Namely by directly regulating the mode of received optical power size to control within suitable scope by the power of light signal, and do not need to reduce APD reverse bias voltage, solve because APD voltage reduces and best reception state can not be operated in, noise is caused to increase, and cause the technical problem that sensitivity decrease and the error rate increase, reach while preventing luminous power from transshipping, ensure that the technique effect of the sensitivity of Signal reception, also ensure that the error rate can not increase simultaneously;
Further, owing to not needing to increase resistance, so also extra power loss can not be caused;
And, because the program is by directly regulating the mode of received optical power size to control within suitable scope by the power of light signal, and do not need to APD series resistance to regulate the supply power voltage making APD work, so be suitable for for the photodetector not comprising APD yet;
Further, due to luminous power stage circuit in the program, the first current range corresponding to the first current value is first determined; Then be determined at the first pad value corresponding to the first current range, that is for the configuration of optical power attenuation size fractionation, do not need fine adjustment and repeatedly testing element value just can reach rational decay, thus fast response time, easy to use;
Further, the minimal attenuation value of pin configuration light signal can be set, so can meet side circuit needs flexibly by pad value.
Accompanying drawing explanation
Fig. 1 is the structure chart of luminous power overload protecting circuit in the utility model embodiment;
Fig. 2 is the flow chart of luminous power overload protection method in the utility model embodiment.
Embodiment
The utility model provides a kind of luminous power overload protecting circuit, when solving the problem of luminous power overload by the mode of resistance reducing APD to solve in prior art, cause the technical problem of receiving sensitivity step-down.
Technical scheme in the embodiment of the present application is solve above-mentioned technical problem, and general thought is as follows:
Provide a kind of luminous power overload protecting circuit, comprising: photocurrent detection device, for detecting receiving optical signals and the size of the luminous power of light signal being converted to current signal; Luminous power stage circuit, is connected to described photocurrent detection device, for determining the first pad value of described light signal based on the first current value of described current signal, and produces based on described first pad value the control signal controlled described luminous power; Optical signal input, for receiving described light signal; Optical power attenuation device, is connected to described luminous power stage circuit and described optical signal input, and for after the light signal receiving the input of described optical signal input, the power controlling described light signal based on described control signal is less than predetermined power value; Light signal output end, is connected to described optical power attenuation device, for receiving the light signal of described optical power attenuation device input and exporting.Namely by directly regulating the mode of received optical power size to control within suitable scope by the power of light signal, and do not need to reduce APD reverse bias voltage, solve because APD voltage reduces and best reception state can not be operated in, noise is caused to increase, and cause the technical problem that sensitivity decrease and the error rate increase, reach while preventing luminous power from transshipping, ensure that the technique effect of the sensitivity of Signal reception, also ensure that the error rate can not increase simultaneously;
Further, owing to not needing to increase resistance, so also extra power loss can not be caused;
And, because the program is by directly regulating the mode of received optical power size to control within suitable scope by the power of light signal, and do not need to APD series resistance to regulate the supply power voltage making APD work, so be suitable for for the photodetector not comprising APD yet;
Further, due to luminous power stage circuit in the program, the first current range corresponding to the first current value is first determined; Then be determined at the first pad value corresponding to the first current range, that is for the configuration of optical power attenuation size fractionation, do not need fine adjustment and repeatedly testing element value just can reach rational decay, thus fast response time, easy to use;
Further, the minimal attenuation value of pin configuration light signal can be set, so can meet side circuit needs flexibly by pad value.
In order to better understand technique scheme, below by accompanying drawing and specific embodiment, technical solutions of the utility model are described in detail, the specific features being to be understood that in the utility model embodiment and embodiment is the detailed description to technical solutions of the utility model, instead of the restriction to technical solutions of the utility model, when not conflicting, the technical characteristic in the utility model embodiment and embodiment can combine mutually.
First aspect, the utility model embodiment provides a kind of luminous power overload protecting circuit, please refer to Fig. 1, comprising:
Photocurrent detection device 2, for detecting receiving optical signals and the size of the luminous power of light signal being converted to current signal;
Luminous power stage circuit 4, is connected to photocurrent detection device 2, for the first pad value of the first current value determination light signal based on the signal of telecommunication, and produces the control signal controlled luminous power based on the first pad value;
Optical signal input 1, for receiving optical signals;
Optical power attenuation device 3, is connected to luminous power stage circuit 4 and optical signal input 1, and for after the light signal receiving optical signal input 1 input, the power controlling light signal based on control signal is less than predetermined power value;
Light signal output end 8, is connected to optical power attenuation device 3, and the light signal inputted for received optical power attenuator 3 also exports.
For example, this luminous power overload protecting circuit is such as applied to GPON ONU (Gigabit PassiveOptical Network Optical Network Unit: Gigabit Passive Optical Network optical network unit), GPON (Gigabit Passive Optical Network: Gigabit Passive Optical Network) optical module, EPON ONU (Ethernet Passive Optical Network Optical Network Unit: Ethernet passive optical network optical network unit) or EPON optical module etc., wherein GPON ONU, GPON optical module comprises APD, EPON ONU or EPON optical module do not comprise APD.
To be introduced respectively above-mentioned all parts below.
Wherein, light signal, after entering this luminous power overload protecting circuit, is divided into two circuits, and the light signal of first line then enters photocurrent detection device 2, and is converted to current signal by photocurrent detection device 2.
By the first current value of current signal, luminous power stage circuit 4 mainly determines whether light signal transships (there is certain relation through the current value that photocurrent detection device detects because of luminous power and its), and then the first pad value of light signal is determined based on the degree whether power of light signal transships and transship, three kinds of enumerating below wherein determine that mode is introduced, certainly, in specific implementation process, following three kinds of situations are not limited to.
The first, luminous power stage circuit 4, specifically for: based on the corresponding relation between current value and pad value, determine and the first pad value corresponding to the first current value.
For example, can for each current value in the starting stage, determine that it can keep the performance number of light signal to be less than pad value corresponding to predetermined power value respectively, and the corresponding relation between store electricity flow valuve and pad value, and then just can obtain the first pad value corresponding to the first current value by this corresponding relation, thus the control realized the power of light signal, owing to there being the pad value of its correspondence for each current value, so have the more accurate technique effect of control.
The second, luminous power stage circuit 4, specifically for: determine the first current range corresponding to the first current value; Be determined at the first pad value corresponding to the first current range.
For example, luminous power stage circuit 4 first can carry out segmentation to received optical power used in everyday and divide scope, for the probe current value that the maximum luminous power of each scope is corresponding, such as: between the power of light signal and probe current value, following corresponding relation can be there is:
The power * responsiveness of probe current value=light signal ... [1] Conversion of measurement unit relation:
DBm=10*log
10(luminous power/1mW) ... [2]
Wherein, response efficiency, according to the material difference difference to some extent of photocurrent detection device 2, generally equals 0.85A/w or 0.8A/w.
Under normal circumstances, when light signal is a certain scope, the pad value that it can be corresponding identical, corresponding relation such as shown in table 1:
Table 1
| The power (dBm) of light signal | <-8 | -8～-4 | -4～0 | 0～3 |
| Pad value (dB) | 0 | 5 | 10 | 15 |
Then above-mentioned table 1 can be converted into the corresponding relation between current value and pad value, such as shown in table 2, responsiveness gets 0.85A/w herein:
Table 2
| Current value (uA) | <135 | 135～338 | 338～850 | 850～1696 |
| Pad value (dB) | 0 | 5 | 10 | 15 |
And then luminous power stage circuit 4, after the first current value obtaining the signal of telecommunication, just can determine the first pad value of light signal by above-mentioned table 2.
The third, luminous power stage circuit 4, specifically for: determine the first performance number corresponding to the first current value; Determine the first pad value corresponding to the first performance number.
For example, namely can calculate the first performance number by above-mentioned formula [1], after calculating the first performance number, the first pad value can be determined in several ways again, two kinds of enumerating below are wherein introduced, certainly, in specific implementation process, be not limited to following two kinds of situations.
1. the corresponding relation based on performance number and pad value determines the first pad value.
Such as, can for the performance number of each light signal in the starting stage, determine that it can keep the performance number of light signal to be less than pad value corresponding to predetermined power value respectively, and the corresponding relation stored between the performance number of light signal and pad value, and then directly obtain the first pad value corresponding to the first performance number by corresponding relation.
2. determine the first performance number scope corresponding to the first performance number, determine the first pad value corresponding to the first performance number scope.
For the corresponding relation between the performance number scope shown in table 1 and pad value, suppose that the first performance number is 2dBm, then can determine that the first performance number scope is 0 ~ 3dBm, thus determine that the first pad value is 15dB.
Light signal is after entering this luminous power overload protecting circuit, and the light signal through the second circuit then directly enters optical signal input 1, then through optical power attenuation device 3;
Optical power attenuation device 3 is after receiving light signal, and the control signal that just can be sent by luminous power stage circuit 4 realizes controlling the watt level of light signal.Wherein predetermined power value is such as-8dBm (can certainly be other values, such as: 0dBm ,-4dBm etc.), if wherein the power of light signal is not more than-8dBm, then the first pad value corresponding to control signal is 0, also namely can not change the size of the power of light signal; If the power of light signal is greater than-8dBm, then the first pad value corresponding to control signal can be different according to the difference of the size of the power of light signal.Through the control of optical power attenuation device 3, thus can ensure that the power of light signal is less than predetermined power value, and then realize the overload protection of power of light signal.Optical power attenuation device 3 is such as: automatically controlled optical power attenuation device 3.
In specific implementation process, when luminous power stage circuit 4 produces control signal, can produce the control signal of various ways, two kinds of enumerating below are wherein introduced, and certainly, in specific implementation process, are not limited to following two kinds of situations.
The first, luminous power stage circuit 4, specifically for: the current controling signal that optical power attenuation device 3 is controlled is produced based on pad value.
The second, luminous power stage circuit 4, specifically for: the voltage control signal that optical power attenuation device 3 is controlled is produced based on pad value.
As further preferred embodiment, please continue to refer to Fig. 1, this circuit also comprises:
Pad value arranges pin 5, be connected to luminous power stage circuit 4, for arranging the minimal attenuation value of light signal, wherein minimal attenuation value is such as: 5dB, 3dB etc., different minimal attenuation values can be set according to the actual requirements, in addition, the step value of pad value can also be set, such as: 5dB, 10dB etc.This luminous power stage circuit 4 inside has configured the decay stepping of attenuation steps, but adjustable intraware, realizing stepping is flexibly 3dB or 5dB etc.
As further preferred embodiment, please continue to refer to Fig. 1, this circuit also comprises:
Grounding pin 7, grounding pin one end is connected to luminous power stage circuit 4, other end ground connection;
VCC (power input pin: Voltage Current Condenser) 5, is connected to luminous power stage circuit 4, for giving circuit supply.
Second aspect, conceives based on same utility model, and the utility model embodiment provides a kind of luminous power overload protection method, please refer to Fig. 2, comprising:
Step S201: luminous power is converted to current signal by first line receiving optical signals;
Step S202: by the first pad value of the first current value determination luminous power of current signal;
Step S203: produced the control signal that the power of light signal is controlled by the first pad value;
Step S204: the power being controlled the light signal of the second circuit by control signal is less than predetermined power value;
Step S205: after the power of light signal is adjusted, output optical signal.
Optionally, by the first pad value of the first current value determination light signal of the signal of telecommunication, be specially:
Based on the corresponding relation between current value and pad value, determine and the first pad value corresponding to the first current value.
Optionally, by the first pad value of the first current value determination light signal of the signal of telecommunication, specifically comprise:
Determine the first current range corresponding to the first current value;
Be determined at the first pad value corresponding to the first current range.
Optionally, by the first pad value of the first current value determination light signal of the signal of telecommunication, specifically comprise:
Determine the first performance number corresponding to the first current value;
Determine the first pad value corresponding to the first performance number.
The one or more embodiment of the utility model, at least has following beneficial effect:
Due in the utility model embodiment, provide a kind of luminous power overload protecting circuit, comprising: photocurrent detection device, for detecting the size of received optical power and being converted to current signal; Luminous power stage circuit, is connected to described photocurrent detection device, for determining the first pad value of described light signal based on the first current value of described current signal, and produces based on described first pad value the control signal controlled described luminous power; Optical signal input, for receiving described light signal; Optical power attenuation device, is connected to described luminous power stage circuit and described optical signal input, and for after the light signal receiving the input of described optical signal input, the power controlling described light signal based on described control signal is less than predetermined power value; Light signal output end, is connected to described optical power attenuation device, for receiving the light signal of described optical power attenuation device input and exporting.Namely by directly regulating the mode of received optical power size to control within suitable scope by the power of light signal, and do not need to reduce APD reverse bias voltage, solve because APD voltage reduces and best reception state can not be operated in, noise is caused to increase, and cause the technical problem that sensitivity decrease and the error rate increase, reach while preventing luminous power from transshipping, ensure that the technique effect of the sensitivity of Signal reception, also ensure that the error rate can not increase simultaneously;
Further, owing to not needing to increase resistance, so also extra power loss can not be caused;
And, because the program is by directly regulating the mode of received optical power size to control within suitable scope by the power of light signal, and do not need to APD series resistance to regulate the supply power voltage making APD work, so be suitable for for the photodetector not comprising APD yet;
Further, due to luminous power stage circuit in the program, the first current range corresponding to the first current value is first determined; Then be determined at the first pad value corresponding to the first current range, that is for the configuration of optical power attenuation size fractionation, do not need fine adjustment and repeatedly testing element value just can reach rational decay, thus fast response time, easy to use;
Further, the minimal attenuation value of pin configuration light signal can be set, so can meet side circuit needs flexibly by pad value.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (2)
1. a luminous power overload protecting circuit, is characterized in that, comprising:
Photocurrent detection device, is converted to current signal for receiving optical signals by the size of the luminous power of described light signal;
Luminous power stage circuit, is connected to described photocurrent detection device, for determining the first pad value of described light signal based on the first current value of described current signal, and produces based on described first pad value the control signal controlled described luminous power;
Optical signal input, for receiving described light signal;
Optical power attenuation device, is connected to described luminous power stage circuit and described optical signal input, and for after the light signal receiving the input of described optical signal input, the power controlling described light signal based on described control signal is less than predetermined power value;
Light signal output end, is connected to described optical power attenuation device, for receiving the light signal of described optical power attenuation device input and exporting.
2. circuit as claimed in claim 1, is characterized in that, also comprise:
Pad value arranges pin, is connected to described luminous power stage circuit, for arranging the minimal attenuation value of described light signal.
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| CN201520217522.7U CN204517815U (en) | 2015-04-10 | 2015-04-10 | A kind of luminous power overload protecting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779995A (en) * | 2015-04-10 | 2015-07-15 | 博为科技有限公司 | Optical power overload protection circuit and method |
| CN115426052A (en) * | 2022-11-04 | 2022-12-02 | 之江实验室 | Overload protection device and method for optical module receiving end |
-
2015
- 2015-04-10 CN CN201520217522.7U patent/CN204517815U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779995A (en) * | 2015-04-10 | 2015-07-15 | 博为科技有限公司 | Optical power overload protection circuit and method |
| CN115426052A (en) * | 2022-11-04 | 2022-12-02 | 之江实验室 | Overload protection device and method for optical module receiving end |
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